Sen. Marco Rubio pressed Donald Trump's secretary of state pick on Vladimir Putin's involvement in the Syrian war and whether the Russian president committed war crimes.

"Is Vladimir Putin a war criminal?" Rubio asked.

"I would not use that term," Rex Tillerson answered.

Rubio even brought up all the information that has been confirmed in reports about the situation in Aleppo. But during his confirmation hearing Wednesday, Tillerson wouldn't take a strong stance on anything, really.